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Adjust to the moving target called the C++ standard. Apparently nowadays it's not allowed to define an explicit copy constructor but not an assignment operator. Consequently, defining the explicit copy constructor in terms of the implicit/automatic assignment operator for general convenience no longer works. Add assignment operators. Caution: not tested with the IBM compiler, but there's no particular reason it shouldn't work.
author David A. Holland
date Mon, 30 May 2022 23:46:22 -0400
parents 13d2b8934445
children
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1 /*
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2 AnaGram Programming Examples
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3 FC2: Multiple Fahrenheit-Celsius conversions with signed numbers
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4 and error resynchronization.
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5
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6
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7 Copyright 1993 Parsifal Software. All Rights Reserved.
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8
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9 This software is provided 'as-is', without any express or implied
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10 warranty. In no event will the authors be held liable for any damages
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11 arising from the use of this software.
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12
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13 Permission is granted to anyone to use this software for any purpose,
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14 including commercial applications, and to alter it and redistribute it
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15 freely, subject to the following restrictions:
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16
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17 1. The origin of this software must not be misrepresented; you must not
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18 claim that you wrote the original software. If you use this software
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19 in a product, an acknowledgment in the product documentation would be
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20 appreciated but is not required.
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21 2. Altered source versions must be plainly marked as such, and must not be
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22 misrepresented as being the original software.
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23 3. This notice may not be removed or altered from any source distribution.
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24 */
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25
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26 [
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27 test file mask = "*.fc2" // C1
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28 traditional engine /* turn this off for production use */ // C2
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29 ]
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30
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31 eof = -1
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32
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33 grammar
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34 -> [temperature, '\n']..., eof // P1
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35
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36 temperature
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37 -> number:n, 'c' + 'C' ={ /* P2 */
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38 printf("%d\370F = %d\370C\n",9*n/5 + 32,n);
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39 }
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40 -> number:n, 'f' + 'F' ={ /* P3 */
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41 printf("%d\370F = %d\370C\n",n,5*(n-32)/9);
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42 }
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43 -> error // P4
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44
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45 (int) number
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46 -> '-', integer:n =-n; // P5
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47 -> '+'?, integer:n =n; // P6
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48
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49 (int) integer
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50 -> '0-9':d =d-'0'; // P7
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51 -> integer:n, '0-9':d =10*n+d-'0'; // P8
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52